Question

W , radiometrle dates help earth scientista refine their interpretation y of an area Complete questions 18-25 will aid in understanding how both types of dates are often used together. 18. Using the principles of relative dating, determine the geologie history of the areas represented by Figure 16 from the oldest to the youngest feature Figure 16: Geologic block diram of a hypothetical fault (M), and sedimentary rocks showing grous intrusive features (K and L), a 19. Asume that the rock layers and in Figure 16 contain radioactive material with a half million years. An analysis of ample of rockthor Dated that an equal proportion opet of 125 c ent and daughter element produced from the What p e other decayed to the product 20. How many half lives of the parent chem have chaped c ock D formed 21. What the numerical of rock 22. Aume that the analysis of a mple of rock free layer indicates itse to be 100 ml wa How many years the interval of the represented by the conformity that parte rock layer D from layer lExplain how you are at your new 23. Is the off your or older than 100 million years? Explain how you arrived at your 21. What is the approximate maximum numerical ne of the contration L? Explain how you are at your awer

I need help on question 22. Please explain as well

Answer 1

It is given that that half life of radioactive element in layer D and I is 425 million years. Also in question 19 its given that equal propotation of parent and daughter present in D layer (i.e. 1 half life). Which means age of layer D is 425 million years.

Now in question 22 its given that age of layer I is 400 million years

So the interval of time represented by unconformity between D and I is

425 - 400 = 25 million year

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